Effect of K+ and H+ stress and role of Ca2+ in the regulation of intracellular K+ concentration in mung bean roots

Keiichi Torimitsu, Makoto Hayashi, Eiji Ohta, Makotu Sakata

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The effects of external K+, H+ and Ca2+ concentrations on the intracellular K+ concentration, [K+]i, and the K+‐ATPase activity in 2‐day‐old mung bean roots [Vigna mungo (L.) Hepper] were investigated. [K+]i, in mung bean roots was markedly decreased by external K+ or H+ stress and did not recover the initial value even after the stress was removed. This decrease in [K+]i, gradually disappeared with the addition of (Ca2+. Ca2+ may offset the harmful effects of ion stress. Ca2+ seems to have two effects on K+ transport; control of K+ permeability and activation of K+ uptake, although K+‐ATPase activity was inhibited by Ca2+ concentrations higher than 10–4 M. We suggest that Ca2+ activates K+ uptake indirectly through the acidification of the cytoplasm.

Original languageEnglish
Pages (from-to)247-252
Number of pages6
JournalPhysiologia Plantarum
Volume63
Issue number3
DOIs
Publication statusPublished - 1985 Mar
Externally publishedYes

Keywords

  • 31P‐NMR
  • Intracellular pH, ion stress. K‐ATPase
  • Vigna inungo

ASJC Scopus subject areas

  • Physiology
  • Genetics
  • Plant Science
  • Cell Biology

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